Abstract：
:A type Ia supernova is thought to be a thermonuclear explosion of either a single carbon-oxygen white dwarf or a pair of merging white dwarfs. The explosion fuses a large amount of radioactive (56)Ni (refs 1-3). After the explosion, the decay chain from (56)Ni to (56)Co to (56)Fe generates γ-ray photons, which are reprocessed in the expanding ejecta and give rise to powerful optical emission. Here we report the detection of (56)Co lines at energies of 847 and 1,238 kiloelectronvolts and a γ-ray continuum in the 200-400 kiloelectronvolt band from the type Ia supernova 2014J in the nearby galaxy M82. The line fluxes suggest that about 0.6 ± 0.1 solar masses of radioactive (56)Ni were synthesized during the explosion. The line broadening gives a characteristic mass-weighted ejecta expansion velocity of 10,000 ± 3,000 kilometres per second. The observed γ-ray properties are in broad agreement with the canonical model of an explosion of a white dwarf just massive enough to be unstable to gravitational collapse, but do not exclude merger scenarios that fuse comparable amounts of (56)Ni.
journal_name
Naturejournal_title
Natureauthors
Churazov E,Sunyaev R,Isern J,Knödlseder J,Jean P,Lebrun F,Chugai N,Grebenev S,Bravo E,Sazonov S,Renaud Mdoi
10.1038/nature13672subject
Has Abstractpub_date
2014-08-28 00:00:00pages
406-8issue
7515eissn
0028-0836issn
1476-4687pii
nature13672journal_volume
512pub_type
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